Persistence in corporate performance is analyzed in the framework of empirical tests of unit root behavior concerning firm profits. Data for firm-specific rates of return is applied in a set of panel unit root tests to address the question of persistence in profits both at firm level and for the...

According to the economic literature, industrial clusters are groups of firms on the same <p> location composing a production system with spillovers that can be vertical and/or <p> horizontal. This paper focuses on horizontal clusters by exploring the spatial <p> distribution of industrial clusters in...</p></p></p>

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